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Code I039


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Thanks for the info Bruce. I have a reading IO39 current. I found where this means CCR problem? This is for a 92 STS 4.9. What does this mean. I'm having a engine miss after driving at hwy speeds for 30 mins is why I'm checking.


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IO39 and a engine miss are 2 differnent issues. The IO39 on the '92 indicates a problem in the SSS/CCR ride system.

If you have IO39 you have to go to the specfic module in the trunk and pull the flash codes from there.

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